Re: [Xen-users] DomU Fails when network load is high

[Steve Wray <steve.wray@xxxxxxxxx>]

Chris Holland wrote:
> Hello,
>
> I am using Gentoo 2008.1 with Xen 3.2.1
> I am having an unusual problem with a DomU, it is setup as a router. The 
> DomU is connected to 2 NICs, one of which is connected to the outside 
> and the other to the internal network.
> When I pass a large amount of data through this DomU like a large 
> torrent download for example, the DomU simply dies with no errors or any 
> indication. It just fails and I have to
> re-create the vm.
> If any more info is needed please let me know and I will provide it.
I've seen problems with high network load and simultaneous high I/O load 
on the disk. This was affecting drbd replication very badly.
The solution I found was to use the 'rate' parameter on the VIF eg:

vif = [ "rate=20MB/s,mac=00:16:3e:00:01:02, bridge=xenbr2",
        "rate=20MB/s,mac=00:16:3e:00:00:02 ,bridge=xenbr0" ]

no other tuning gave any improvement, from disabling tcpchecksum 
offloading to all manner of sysctl tweaking.

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